基本解释[金融] 未确认信用证；[金融] 不保兑信用证词组短语短语unconfirmed E letter of credit 未确认信用证unconfirmed U letter of credit 未确认信用证an unconfirmed letter of credit 未经证实的谣传专业释义经济学不确认信用证非保兑信用证未确认信用证不保兑信用证